The Instrumentation Control Unit (ICU) and Fault Codes

ep4 9.01.004

Note: Some non-critical faults may be suppressed and will not appear during an instrumentation control unit (ICU) self-check.

The majority of electrical and electronic issues on the vehicle will have an associated fault code, which will be displayed on the ICU.

If the ICU receives active fault codes during the ICU self-check, it displays them one after the other until the parking brake is released or the keyswtich is turned off. Once the parking brake is completely released, the ICU displays alerts until acknowledged. If there are no active faults, the ICU displays the home screen after the self-check completes.

When there is an active vehicle fault code, a popup appears on the ICU message screen. See Table for a list of Acronyms used in fault codes for the ICU.

Table 1, ICU Electronic Control Unit Acronyms

Acronym	Meaning	Acronym	Meaning
ABS	Antilock Brake System	EHPS	Electro-Hydraulic Power Steering
BMS#	Battery Management System There can be up to nine battery management systems: BMS1, BMS2, . . . BMS9.	ETCM	Electronic Transmission Control Module
CGW	Central Gateway	HVCF	Heating/Ventilation/AC Front (HVAC)
DBC	Direct Current Box	ICU	Instrumentation Control Unit
DCL	DC/DC Converter	RDF	RDF Radar Front End
DCMD	Door Control Module, Driver	SAS	Steering Angle Sensor
DCMP	Door Control Module, Passenger	SSAM	Single Signal Detect and Actuation Module
EAPU	Electronic Air Processing Unit	TPMS	Tire Pressure Monitoring System
ECPC	Electronic Common Powertrain Controller	VRDU	Video Radar Decision Unit

Table 1, ICU Electronic Control Unit Acronyms

Note:

eCascadia Driver’s Manual

The Instrumentation Control Unit (ICU) and Fault Codes

Table 1, ICU Electronic Control Unit Acronyms

Table 1, ICU Electronic Control Unit Acronyms